python_codes.linear_theory.By

By(alpha, B0)

Calculate the hydrodynamic coefficient \(\mathcal{B}_{y}\) using the geometrical model:

\[\mathcal{B}_{y} = 0.5*\mathcal{B}_{0}\cos\alpha\sin\alpha\]

Parameters

• alpha (array, scalar) – Dune orientation with respect to the perpendicular to the flow direction (in degree).

• B0 (array, scalar) – value of the hydrodynamic coefficient for \(\alpha = 0\), i.e. for a dune orientation perpendicular to the flow direction.

Returns

the hydrodynamic coefficient.

Return type

array, scalar